Kontact, as a former shop mechanic for almost 40 years, I agree with you. Centering of the rotor in the caliper has nothing to do with a vibration problem.

I had a Specialized road bike with an unsolvable squealing front brake problem. Fortunately for the owner, the bike was under warranty. Specialized immediately pushed the problem onto Sram, and Sram, being the saints that they are, willingly took on the issue and we replaced the entire front brake system, including the lever. No solution.
Installed a front brake from the same model that we had in stock. No solution.
I then took a wheel off of a Giant road bike and put it on the Specialized and this solved the issue. The wheel was the problem, not the rotor, not the pads, not the caliper, not the fork, not any other part of the bike. It was the wheel.
Next i took a wheel off a Specialized road bike and had brake noise. I then took an aftermarket wheel of higher quality and the problem went away. At this point I informed Specialized of all this and convinced them to send out a replacement wheel set that was one level up from the stock Roval that came on the bike. This solved the issue. Something about the stock wheel was a problem. Sent it Specialized and they did who knows what with it.

This experience had me change my tune about Sram, they are in my good graces now, and it confirmed why I prefer rim brakes for my own bikes.